Pressure relief valves adapted for low pressure operation

Details Pressure relief valves adapted for low pressure operation Pressure relief valves adapted for low pressure operation

1994-08-30

1996-09-17

Hepperle, Stephen M.

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

137489, 251 31, F16K 17196

Patent

active

055559107

ABSTRACT:
A safety relief valve (10) having a main valve member (22) in a normally closed seated position has a diaphragm actuator (24) with a dome chamber (34) adjacent the outer side of the diaphragm (26). A pilot valve (28) is in fluid communication with the dome chamber (34) through a dome line (35) for controlling the opening and closing of the main valve member (22). An underdome chamber (40) on the inner side of the diaphragm (26) has an underdome line 44 extending to an underdome control valve (42) for controlling fluid communication to underdome chamber (40) from the inlet (18). An inlet line (48) extends from the inlet (18) to the underdome control valve (42). When the set pressure of the pilot valve (28) is reached, inlet fluid pressure on the inner side of the diaphragm (26) increases while dome pressure in the dome chamber (34) decreases. Simultaneously, an increase in fluid inlet pressure at inlet (18) actuates underdome control valve (42) to provide direct fluid communication between inlet (18) and underdome chamber (40) to boost the opening of main valve member (22). One embodiment of the invention shown in FIGS. 6 and 7 utilizes a non-pilot operated relief valve member (10C) in which a weight (29C) urges the main valve member (22C) into closed position. An underdome control valve (42C) includes a weight (65C) urging the underdome control valve member (67C) into a seated position.

REFERENCES:
patent: 1995949 (1935-03-01), Spence
patent: 2551334 (1951-05-01), Parks
patent: 2631606 (1953-03-01), Parks
patent: 2974679 (1961-03-01), Heller
patent: 3064675 (1962-11-01), Johnson
patent: 3276467 (1966-10-01), Case
patent: 4226259 (1980-10-01), Szekely
patent: 4589627 (1986-05-01), Grotloh
patent: 4705065 (1987-11-01), McNeely
patent: 5246034 (1993-10-01), Higgins

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